Tire Having Tire Tread Structure Comprising Cap Tread and Base Tread

Abstract

The present invention provides a tire having a tire tread comprising a cap tread and a base tread, use of which makes it possible to prepare for future decrease of petroleum supply, and further, can improve rolling resistance, steering stability and rubber strength in favorable balance, as compared with a tire prepared by using a rubber composition for a tread or a tire prepared by using a rubber composition for a base tread, which mainly comprises materials derived from petroleum resources. The tire has a tire tread comprising a cap tread and a base tread, the base tread being prepared by using a rubber composition for a base tread comprising 25 to 80 parts by weight of silica on the basis of 100 parts by weight of a rubber component comprising a natural rubber, and a thickness of the base tread being 17 to 50% of the overall thickness of the tire tread.

Description

TECHNICAL FIELD[0001]The present invention relates to a tire having a tire tread comprising a base tread and a cap tread.BACKGROUND ART[0002]In recent years, characteristics required for a tire are wide-ranging, such as steering stability, abrasion resistance, and ride quality in addition to low fuel consumption. In order to improve these performances, various measures have been taken. Among these performances, particularly grip performance and rolling resistance (low fuel consumption) of a tire are characteristics regarding hysteresis loss of a rubber. In general, as a hysteresis loss becomes larger, grip force becomes larger and thus braking performance is improved. However, rolling resistance also becomes larger, and fuel consumption is increased. As described above, grip performance and rolling resistance are incompatible with each other. Therefore, in order to satisfy both of the properties simultaneously, various rubber compositions for a tread have been suggested.[0003]There ...

AI Technical Summary

Benefits of technology

[0007]It is an object of the present invention to provide a tire having a tire tread comprising a cap tread and a base tread, use of which makes it possible to provide for decrease in petroleum supply in future, and improve rolling resistance, steering stability and rubber strength in favorable balance, as compared with a tire produced by using a rubber composition for a tread or a rubber composition for a base tread, which mainly comprises materials derived from petroleum resources.

Problems solved by technology

However, rolling resistance also becomes larger, and fuel consumption is increased.

As described above, grip performance and rolling resistance are incompatible with each other.

Further, since petroleum resources are limited and supply thereof has been decreasing year by year, increase of an oil price in future is predicted.

Therefore, there is a limitation in use of materials derived from petroleum resources such as synthetic rubbers and carbon black.

However, when silica is compounded, although rolling resistance can be lowered, there has been a problem that grip performance is lowered.

However, rolling resistance, steering stability and rubber strength are not improved in favorable balance, and thus further improvements are still required.